Having an outside diameter less than 38.1 mm
Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter less than 38.1 mm
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter
Products classified under HTS 7304.59.20.40
Alloy TP347H Boiler Tube OD 32mm
Seamless TP347H stabilized stainless alloy tube, 32 mm OD, for thick-walled boiler applications. Niobium stabilization prevents carbide precipitation in superheater service. 7304.59.20.40 for diameter and boiler suitability despite stainless alloy.
Alloy Steel Boiler Tube OD 25.4mm
Seamless tube made from alloy steel, with an outside diameter of 25.4 mm, designed specifically for use in high-pressure boilers. It meets standards for elevated temperature service in superheaters and heat exchangers due to its precise metallurgical composition. Classified under 7304.59.20.40 for its small diameter and boiler suitability.
SA-213 TP304 Boiler Tube OD 19mm
Seamless TP304 stainless alloy steel tube per ASME SA-213, outside diameter 19 mm, for superheaters and heat exchangers in power plants. Its corrosion resistance and strength at high temperatures qualify it for boiler applications. Fits 7304.59.20.40 due to diameter and specified end use.
T11 Alloy Heat Exchanger Tube OD 31.75mm
Seamless ASTM A335 Grade T11 alloy steel tube, OD 31.75 mm, optimized for condensers and feedwater heaters in refining furnaces. Low alloy content provides creep resistance under thermal stress. Under 7304.59.20.40 for small OD and heat exchanger suitability.
P22 Superheater Tube OD 28mm
Seamless P22 (2.25Cr-1Mo) alloy steel tube with 28 mm OD for superheaters in utility boilers. Engineered for prolonged exposure to steam at 500°C+. Classified in 7304.59.20.40 for alloy steel, circular seamless, small diameter, and superheater use.
Alloy Steel Condenser Tube OD 22mm
Seamless alloy steel tube OD 22 mm for steam condensers in power generation plants. Provides excellent thermal conductivity and corrosion resistance in wet environments. Meets 7304.59.20.40 criteria: seamless, alloy, <38.1 mm OD, condenser-suitable.
T9 Feedwater Heater Tube OD 35mm
Seamless ASTM A213 T9 alloy steel tube, 35 mm OD, for feedwater heaters in thermal power stations. High chromium content resists oxidation in preheated water systems. 7304.59.20.40 applies to its small diameter and designated heater application.
Grade 91 Refining Furnace Tube OD 30mm
Seamless Grade 91 (9Cr-1Mo-V) alloy steel tube OD 30 mm for refining furnace transfer lines. Normalized and tempered for creep strength above 600°C. Fits 7304.59.20.40: alloy steel, seamless, small OD, refining furnace suitable.
T5 Condenser Service Tube OD 20mm
Seamless T5 (5Cr-0.5Mo) alloy steel tube OD 20 mm for condenser water service in marine applications. Provides erosion resistance in high-velocity flows. Classified 7304.59.20.40 for small OD and condenser end-use.
P5 Heat Exchanger U-Tube OD 25mm
Seamless P5 (5Cr-0.5Mo) alloy steel U-bent tube OD 25 mm for shell-and-tube heat exchangers. Bends formed cold then stress-relieved for fatigue resistance. 7304.59.20.40 applies to seamless alloy tubes <38.1 mm OD suitable for heat exchangers.